DUCAB Cable Manufacturing Company Technition Opretor Interview Questions and Answers

There are four main types of refrigeration compressors: reciprocating, rotary, screw, and centrifugal.

• Reciprocating compressors use pistons to compress refrigerant gas.

• Rotary compressors use rotating vanes or rollers to compress refrigerant gas.

• Screw compressors use two interlocking screws to compress refrigerant gas.

• Centrifugal compressors use a spinning impeller to compress refrigerant gas.

• Each type of compressor has...read more

AC voltage changes direction periodically while DC voltage flows in one direction only.

• AC voltage alternates direction at a certain frequency while DC voltage flows in one direction only

• AC voltage is used for power transmission over long distances while DC voltage is used for electronic devices

• AC voltage can be easily transformed using a transformer while DC voltage cannot

• Examples of AC voltage sources include power ou...read more

Ground Earth is used as a reference point for electrical systems and for safety purposes.

• Grounding helps to prevent electrical shock and equipment damage.

• It provides a path for excess electrical current to flow safely to the earth.

• It is used in electrical systems to establish a common reference point for voltage measurements.

• Grounding is also important in lightning protection systems.

• It is required by electrical codes